Vertical chamber, open throat round baler having no starter roll

ABSTRACT

The vertical chamber of the open throat, vertical chamber baler has its bottom inlet opening devoid of a starter roll. A resilient rotary rake tine assembly positioned below and ahead of the inlet opening picks up crop material from the ground and delivers it to a rigid tooth feeder spaced below the inlet opening in vertical alignment therewith. At the beginning of each bale forming cycle when the chamber is small and empty, the rigid tooth feeder propels the crop material into the chamber and against the upwardly moving rear belt stretch which encourages the material to tumble forwardly against the downwardly moving front belt stretch. The oppositely moving surfaces presented by the front and rear belt stretches encourage the tumbling material to coil into a bale core, which ultimately forms a larger bale. In the event loose material drops through the bottom inlet opening during core starting, such material is immediately returned to the chamber by the rigid tooth feeder along with other material delivered to the rigid tooth feeder in the meantime.

TECHNICAL FIELD

The present invention relates to round balers and, more particularly, toopen throat, vertical chamber machines in which the bale is formed, fromstart to finish, up in the vertical chamber above a relatively wide openinlet in the bottom of the chamber.

BACKGROUND

The open throat, vertical chamber style of round baler has become thestandard in the industry for variable chamber machines. Such machinesoperate on what may be described as a single-stage baling principle inwhich the bale is formed from beginning to end in the same chamber.Thus, at the start of a new baling cycle, incoming crop material is feddirectly into the forming chamber instead of first entering into somekind of a small, precompression starting chamber beside or below themain chamber as in two-stage machines. In such two-stage machines, theincoming material during stage one at the beginning of a new balingcycle coils into a precompressed, relatively dense core within the smallstarting chamber before it then deflects a forming belt sufficiently topush its way into the main chamber, where it completes its formation instage two.

The open throat, vertical chamber machine is an excellent startingmachine because there is no attempt to coil or compress the cropmaterial until it is first safely inside the baling chamber. It alsostarts well because of its vertical orientation at the beginning of anew baling cycle when an upwardly moving surface at the rear of thechamber lifts and tumbles the crop forwardly, while a downwardly movingsurface at the front of the chamber lowers and coils the crop ontoitself.

However, the chamber is supplied with material through a relativelywide, non-compressive inlet opening at the bottom of the chamber.Therefore, unless the starting material quickly forms into a coil thatis larger than the width of the opening, there may be a tendency in somecrop conditions for the downwardly moving material at the front of thechamber to come back down out through the opening. If it lands on therelatively skimpy, resilient rake tines of the pickup mechanism, thetines may not be strong enough to feed the mass of fallen material backup into the chamber. Consequently, the machine may plug.

In the past a starter roll has typically been provided at the bottom ofthe chamber in such a position that material coming down the frontstretch of the chamber encounters the rearwardly rotating roll and isdirected back toward the rear of the chamber, where it is picked up bythe upwardly moving, rear surface and lifted upwardly with otherincoming material. However, starter rolls have a tendency to wrap withcrop materials in certain conditions and are also fairly expensive,considering not only the cost of the rolls themselves, but also that ofthe drives and bearings for the rolls.

Therefore, for many years there has been a long-felt need in theindustry to find a way to eliminate starter rolls in open throat,vertical chamber machines. Yet, various attempts to solve this problemhave produced only mixed results.

SUMMARY OF THE PRESENT INVENTION

Accordingly, the primary object of the present invention is to provide adesign for a reliable, good starting, commercially successful, openthroat vertical chamber machine that avoids the need for a conventionalstarter roll. This objective is carried out in the present invention byproviding a rigid tooth feeder below the open throat of the chambergenerally vertically aligned with and under the inlet opening of thechamber. A resilient rake tine assembly located ahead of the rigid toothfeeder picks up material from the field and moves it toward the chamber,where it is engaged by the rigid tooth feeder and delivered into thechamber. If any material happens to drop down out of the chamber atstartup due to the absence of a starter roll, the rigid tooth feederpromptly returns it back up into the chamber with other incomingmaterial.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a left side elevational view of a baler incorporating theprinciples of the present invention;

FIG. 2 is a rightside elevational view thereof;

FIG. 3 is a fragmentary, left side elevational view of the baler withthe near sidewall removed and with a full-size bale shown therein, thephantom lines in the bale chamber area indicating the condition of thebale chamber and related components when the chamber is empty at thebeginning of a new baling cycle;

FIG. 4 is a generally horizontal cross-sectional view of the lower driveroll area of the baler taken substantially along line 4--4 of FIG. 3;

FIG. 5 is a slightly enlarged, fragmentary, left side elevational of thebaler with the left sidewall removed illustrating the manner in which acore is started in the baling chamber; and

FIG. 6 is a fragmentary left side elevational view similar to FIG. 5 ofan alternative embodiment of the invention.

DETAILED DESCRIPTION

The embodiment of the invention illustrated in the figures includes abaler 10 having a chassis 12 that is supported for travel by a pair ofground wheels 14 and 16. A tongue 18 projects forwardly from the chassis12 and has a suitable hitch 20 at its front end for connecting the balerto a towing tractor (not shown). A pair of laterally spaced apartsidewalls 22 and 24 are mounted on the chassis 12 and project upwardlytherefrom. The space between the two sidewalls 22 and 24 comprises thearea in which the baling and wrapping cycles are carried out, as will beexplained below.

The baler 10 has a number of transverse rolls and belts that cooperatewith the sidewalls 22,24 to define an internal baling chamber 26 thatassumes different shapes and sizes throughout the bale-forming cycle. Asillustrated best in FIG. 3, the transverse rolls include a lower driveroll 28, a lower idler roll 30, an upper drive roll 32 and idler rolls34, 36, 38, 40, 42, 44, 46, 48, 50, 52 and 54. A series of endless,flexible, side-by-side belts 56 are looped around the rolls 28-54 in thepattern illustrated in FIG. 3. The drive roll 28 and the idler roll 46are located at the bottom of the baling chamber 26 and are spaced apartin a generally fore-and-aft direction to define a non-compressive,chamber inlet opening 58 therebetween. The belts 56 are looped under thedrive roll 28, under the rear idler roll 46, and over the large upperidler roll 52 so that the belts 56 present a pair of generally verticalor upright belt stretches 60 and 62 when the baling chamber 26 is emptyat the beginning of a baling cycle as illustrated in phantom lines inFIG. 3.

A tensioning arm assembly 64 having a pair of vertically swingable arms66 located inside the baler adjacent the two walls 22 and 24 (only oneof such arms being illustrated) supports the two idler rolls 50 and 54in a position to directly overlie the bale during its formation withinthe chamber 26. The rolls 50 and 54 are spaced apart by a distance whichis much less than the width of the inlet opening 58, and the verticalbelt stretches 60 and 62 are confined between the rolls 50 and 54 sothat the rolls 50,54 serve to converge the belt stretches 60,62 towardone another as the rollers 50,54 are approached. Since the rollers 50,52are essentially directly above the inlet opening 58, the rolls 50,54cause the chamber 26 to assume a generally vertical, triangularconfiguration when the chamber 26 is empty as illustrated in phantom inFIG. 3 and the arms 66 are down as also illustrated in phantom in FIG.3. With the drive rolls 28 and 32 rotating clockwise viewing FIG. 3,this imparts a downward motion to the front belt stretch 60 and anupward motion to the rear belt stretch 62 when the chamber 26 is emptyat the beginning of a new bale forming cycle. A slack control armassembly 68 at the upper front comer of the baler includes a pair ofvertically swingable arms 70 (only one being shown) that support theidler rolls 34 and 38 to control the amount of slack paid out to thebelts 56 as the bale grows within the chamber 26.

The arm assemblies 64 and 68 may be of conventional construction as wellunderstood by those skilled in the art. Alternatively, the armassemblies 64 and 68 may be constructed in accordance with thedisclosure in co-pending, contemporaneously filed application Ser. No.08/897,466 now U.S. Pat. No. 5,839,362 titled "Single Cylinder HydraulicTension Control System for Round Balers". The embodiment of theinvention illustrated herein is constructed in accordance with thedisclosure of the above identified application such that the baler 10uses a single hydraulic cylinder 72 on the left side of the machine(FIG. 1) to tension the arm assembly 64 and another single cylinder 74on the left side to tension the slack control assembly 68.

As well known by those skilled in the art, the vertical chamber 26 maybe formed by structures other than the belts 56 of the illustratedembodiment. For example, either or both of the stretches 60,62 could bepresented by a series of transverse rolls supported in generallyvertically stacked, side-by-side relationship, with each stack of rollsbeing swingable away from the upright or vertical starting condition toexpand the chamber as the bale grows larger. A combination of belts androlls could be used. The important principle is that, whatever structureis used, it presents a generally upwardly moving rear surface and agenerally downwardly moving front surface for the baling chamber whenthe chamber is small at the beginning of each new bale forming cycle.

The baling chamber 26 is obviously located well above and off theground. Therefore, some means must be provided for picking up cropmaterials as the baler moves across the field and for delivering thepicked-up materials into the chamber 26. In accordance with theprinciples of open throat, vertical chamber baling, the incoming cropmaterial is not to be subjected to any significant compression until itpasses through the inlet opening 58 and is fully received within thebaling chamber 26. Thus, that part of the crop flow path upstream fromthe chamber 26 is open and noncompressive and may be described as anopen throat 76 (FIG. 5) through which the picked-up crop material passeson its way to the baling chamber 26.

In the illustrated embodiment the crop material is picked up off theground by a standard resilient rotary rake tine assembly 78 locatedbelow and forwardly of the chamber 26 and its inlet opening 58. Theassembly 78 is thus positioned along the lower portion of the throat 76and cooperates with the lower drive roller 28 in helping to define thethroat 76. The resilient rake tines 80 of the assembly 78 describe asomewhat circular path of travel as shown in phantom lines in FIG. 3,although the tines 80 actually are cam-operated and are caused toretract along the rear stretch of their path of travel.

If the rake tine assembly 78 selected for use is wider than the chamber26 in a direction transverse to the path of travel of the machine, thepicked-up material must be converged toward the center bycenter-gathering stub augers 82 or the like before being delivered intothe chamber 26. One suitable stub auger construction for accomplishingthis function is disclosed in co-pending application Ser. No.08/731,764, filed Oct. 18, 1996 and titled "Down Turning Stub Augers onWide Pick-Up for Round Balers". If the rake tine assembly 78 is the samewidth as the chamber 26, center-gathering mechanism is not needed.

A rigid tooth feeder 84 is positioned below and in vertical alignmentwith the inlet opening 58 between the resilient rake tine assembly 78and the lower idler roll 46 along the lower stretch of the throat 76.Feeder 84 is spaced below the lower drive roll 128 and helps to definethe throat 76. In the preferred embodiment, the feeder 84 takes the formof a fork 86 having a series of transversely spaced, rigid teeth 88 thatmove in a generally kidney-shape path of travel illustrated in phantomlines in FIG. 3. The teeth 88 project into the throat 58 during astuffing stroke along the upper half of their path of travel and retractdown out of the throat 76 during a return stroke along the lower half oftheir path of travel. A slotted ramp 90 spanning the distance betweenthe resilient tine assembly 78 and the lower idler roll 46 provides afloor for the throat 58 in the vicinity of the rigid tooth feeder 84 andserves as a stripper plate through which the teeth 88 may retract torelease the crop material at the rear end of the path of travel of theteeth 88.

The fork 86 is pivotally supported by a rotating carrier 91 that rotatescontinuously about a transverse horizontal axis 92. The fork 86 isconnected near its mid-point to the carrier 91 and has its lowerextended end pivotally connected to a control link 94 pivotally coupledwith the chassis 12. Thus, although the carrier 91 rotates in a circularpath of travel, the fork 86 is constrained to move in its kidney-shapepath of travel as illustrated. As shown in FIG. 3, the idler rolls 46and 48 cooperate with the ramp 90 when the bale in chamber 26 growslarger than a starting core to define an eased inlet for materialentering the chamber 26 as disclosed in co-pending application Ser. No.08/731,395, filed Oct. 18, 1996, titled "Eased Inlet Tailgate RollArrangement for Variable Chamber Round Baler".

Contrary to prior open throat, vertical chamber constructions, the baler10 has no starter roll located in the chamber 26 behind the lower driveroll 28. However, also contrary to prior open throat vertical chamberconstructions, the baler 10 has the rigid tooth feeder 84 disposed belowthe open bottom of the chamber 26 in vertical alignment with the inletopening 58. Consequently, the rigid tooth feeder 84 is positioned forprojecting crop materials into the chamber 26 during successive stuffingstrokes, whether such materials comprise only incoming materialsreceived from the resilient tine assembly 78 or also materials that mayhave fallen down out of the chamber 26 during the early stages of balecore starting.

In order to prevent trash build-up above the drive roll 28 that may havebeen caused by the belts 56 sloughing off materials from the bale in thechamber 26, the drive roll 28 is provided with a series sleeves 96 thatunderlie the belts 56 as illustrated in FIG. 4. The sleeves 96, thebelts 56 and the main cylindrical body of the drive roll 28 arepreferably related to one another in the manner disclosed in co-pendingapplication Ser. No. 08/733,757, filed Oct. 18, 1996, titled "TallSleeves for Round Baler Drive Rolls".

In the illustrated embodiment, the resilient rake tine assembly 78 ismounted on the chassis 12 for up and down swinging movement about atransverse axis 98 (FIGS. 1 and 2) which coincides with the axis ofrotation of the stub augers 82. Gauge wheels 100 secured to theresilient rake tine assembly 78 by inverted, generally U-shaped arms 102ride along the ground to cause the resilient tine assembly 78 to swingup or down as necessary to accommodate changes in ground contour. Itwill be noted that in the illustrated embodiment, the stub augers 82 andthe rigid tooth feeder 84 do not pivot with the resilient tine assembly78 but are instead mounted in fixed positions on the chassis 12.However, it is within the scope of the present invention to have allthree of the components comprising the rake tine assembly 78, the rigidtooth feeder 84 and the stub augers 82 constructed as part of a headerunit swingably attached to the chassis 12. In the illustratedembodiment, the gauge wheels 100 are attached to the resilient tineassembly in the manner disclosed and claimed in co-pending applicationSer. No. 08/733,758, filed Oct. 18, 1996, and titled "Over-the-TopSupport Arm for Pick-Up Gauge Wheel of a Baler".

As illustrated particularly in FIGS. 3 and 5, the baler 10 is providedwith a standard windguard 104 overlying the resilient rake tine assembly78. The windguard 104 is pivoted to the chassis 12 at pivot 106 and isbiased by gravity to lie against the wrapper 108 of the resilient tineassembly 78 and the ramp 90 associated with the rigid tooth feeder 84.As incoming crop material flows through the throat 76, the windguard 104is raised off the wrapper 108 and the ramp 90 by the moving cropmaterial as illustrated in FIG. 5. However, the windguard 104 providesno significant compaction of the crop material.

As illustrated in FIG. 3, power for operating the components of thebaler is delivered by a driveline 110 associated with the tongue 18. Thefront end of the driveline 110 is adapted for connection to the powertake-off shaft (not shown) of the towing vehicle, while the rear end ofthe driveline 110 is coupled with the input shaft 112 of a right anglegear box 114 on a transverse structural member 116 of the chassis 12.The output shaft 118 of the right angle gear box 114 is coupled with ashaft 120 (FIG. 1) that extends over to the left sidewall 22 where it isjournaled for rotation. The shaft 120 projects outwardly beyond the leftsidewall 22 where it transfers driving power to the lower drive roll 28and the upper drive roll 32 via respective chain and sprocket assemblies122 and 124. The stub shaft 126 projecting from the left end of thedrive roll 28 is drivingly coupled with the left stub auger of the pairof augers 82 and the rigid tooth feeder 84 via respective chain andsprocket assemblies 128 and 130. As shown in FIG. 2, the stub shaft 132projecting from the right end of the drive roll 28 is operably coupledwith the right stub auger of the pair of augers 82 by a chain andsprocket assembly 134.

When the bale is fully formed within the chamber 26 as illustrated bythe bale 136 in solid lines in FIG. 3, it may be wrapped by a suitablewrapper before being discharged from the baler. In the illustratedembodiment, a twine dispenser 138 is located adjacent the front of thebaler above the windguard 104 for wrapping the finished bale with twineduring the wrapping cycle of the machine. Once wrapped, the bale may bedischarged from the baler by operating a pair of lift cylinders 140 onopposite sides of the machine to elevate the rear half of the sidewalls22,24 and their associated rolls 42, 44, 46 and 48. The rear half of themachine thus finctions as a tailgate that is attached to the front halfand pivots relative thereto about an upper pivot 142 at the top of thebaler.

OPERATION

At the beginning of each new bale forming cycle, the empty balingchamber 26 is generally upright and triangular as shown in phantom linesin FIG. 3. This condition is also illustrated in full lines in FIG. 5,which also shows the flow of incoming material and the commencement of abale core 144. The core 144 is started by the oppositely moving beltstretches 60 and 62 which lift the incoming material at the rear andlower it at the front so as to impart a forward tumbling and coilingaction to the material. As additional material continues to be fed intothe chamber 26, the core 144 starts to grow and deflects the beltstretches 60,62 in opposite fore-and-aft directions. Eventually, thebale grows so much that it assumes the configuration of the bale 136 inFIG. 3, which is ready for wrapping and ejection.

As illustrated in FIG. 5, formation of the core 144 takes place withoutthe usual starter roll. In most cases, the belt stretches 60 and 62,which are converging upwardly toward one another due to the gatheringaction of the idlers 50 and 54, are so effective that they immediatelycoil the incoming material into a mass of sufficient size that it staysup in the bale chamber 26. In certain crop conditions, however, theinitial tumbling material may either fall out of the chamber 26 or bedriven out by the downwardly moving belt stretch 60 at the front of thechamber. If that occurs, the rigid tooth feeder 84 simply flings theloose matter back up into the chamber in engagement with the rear beltstretch 62, along with the additional incoming material. Within only afew strokes of the rigid tooth feeder 84, the core 144 should be ofsufficient size to fully bridge the gap between the drive roll 28 andthe lower rear roll 46 so as to stay up in the chamber 26 for theduration of the forming cycle.

During development of the present invention, it was confirmed that if aresilient rake tine assembly such as the assembly 78 were used in lieuof the rigid tooth feeder 84 as the mechanism for delivering cropmaterial into the chamber 26, a starter roll should also be installed inorder to provide best results in all crop conditions. Having a small,clockwise-rotating starter roll immediately behind the drive roll 128had the effect of forming a ledge or shelf to intercept material drivendownwardly toward the inlet opening 58 by the front belt stretch 60.Since the upper periphery of such a starter roll moved rearwardly towardthe rear belt stretch, the starter roll had the effect of deflecting thedownwardly moving material back to the rear of the chamber where itcould be re-engaged by the upwardly moving rear stretch. The starterroll thus kept the material up in the baling chamber, and kept itturning.

Without the starter roll, while a resilient tine assembly alone workedin many conditions, in some conditions it did not. Apparently, thefailures were caused when loose material in the baling chamber fell backdown through the inlet opening and onto the resilient tines, renderingthem ineffective. The extra mass of material was apparently too heavyfor the resilient tines and they were unable to reintroduce the materialinto the chamber along with the new material that had been added to thethroat area in the meantirne.

By employing both a resilient tine assembly and a rigid tooth feederalong the lower extremity of the open throat in accordance with thepresent invention, a starter roll can be eliminated. The resilient raketine assembly 78 provides the thorough and effective pick-up of cropmaterials from the ground that is necessary and desirable for a baler ofthis type, while the rigid tooth feeder 84 propels the picked upmaterial on into the chamber 26 with sufficient force to handle anymaterial that might be reluctant to stay up in the chamber 26 at startup. Consequently, the advantages of an open throat vertical chambermachine can be achieved without the disadvantages of a starter roll.

ALTERNATIVE EMBODIMENT

FIG. 6 shows an alternative embodiment 210 in which the rigid toothfeeder of the present invention takes the form of a rotating rotor 212with generally radially projecting, rigid teeth 214. The rotor 212rotates about a transverse axis 216 in a clockwise direction viewingFIG. 6, and the teeth 214 sweep upwardly into and along the throat 218to propel material received by the resilient tine assembly 220 into thechamber 222. A stripping grid 224 overlies the space between the hub 226of the rotor 212 and the lower idler roll 228 to strip material from theteeth 214 as the rotor 212 takes the material from the tine assembly 220and projects it into the chamber 222 through the inlet opening 230. Inall other significant respects, the baler 210 is very similar to thebaler 10 of FIGS. 1-5.

Although preferred forms of the invention have been described above, itis to be recognized that such disclosure is by way of illustration only,and should not be utilized in a limiting sense in interpreting the scopeof the present invention. Obvious modifications to the exemplaryembodiments, as hereinabove set forth, could be readily made by thoseskilled in the art without departing from the spirit of the presentinvention.

The inventor(s) hereby state their intent to rely on the Doctrine ofEquivalents to determine and assess the reasonably fair scope of theirinvention as pertains to any apparatus not materially departing from butoutside the literal scope of the invention as set out in the followingclaims.

We claim:
 1. A no starter roll, open throat, vertical chamber roundbaler comprising:an initially relatively small and generally uprightbaling chamber having an inlet located adjacent the bottom of thechamber, said chamber being defined in part by a pair of oppositelymoving, front and rear surfaces wherein the front surface movesgenerally downwardly toward the inlet and the rear surface movesgenerally upwardly away from the inlet when the chamber is small at thebeginning of each bale forming cycle, said inlet being defined in partby the space between a pair of transverse rolls that are separated fromone another in a generally fore-and-aft direction, the bale beingdisposed above said rolls throughout each bale forming cycle includingthe initial stages of formation when a small core is starting in thechamber and the latter stages of formation when the bale has acrosssectional diameter that greatly exceeds the width of the inlet; aresilient rotary rake tine assembly positioned below and ahead of theinlet for lifting crop materials off the ground and feeding them towardthe inlet as the baler moves across a field; and a rigid tooth feederpositioned below and in vertical alignment with the inlet between theresilient rake tine assembly and the rear roll for projecting materialsfrom the rake tine assembly into the chamber, said resilient tineassembly and said rigid tooth feeder being spaced below the front rollof the pair of rolls and cooperating with the front roll to define anopen, non-compressive throat on the upstream side of the chamber thatleads to the inlet, said chamber being devoid of a starter roll in thespace between said pair of transverse rolls.
 2. A no starter roll, openthroat, vertical chamber round baler as claimed in claim 1,said frontsurface of the chamber being defined by a stretch of flexible belts. 3.A no starter roll, open throat, vertical chamber round baler as claimedin claim 2,said rear surface of the chamber being defined by a stretchof flexible belts.
 4. A no starter roll, open throat, vertical chamberround baler as claimed in claim 1,said rigid tooth feeder comprising astuffer fork that operates in a generally kidney-shaped path of travelin successive stuffing and return strokes, the fork having teeth thatproject up into the throat while moving toward the inlet and retractdown out of the throat during each return stroke while moving generallyaway from the inlet.
 5. A no starter roll, open throat vertical chamberround baler as claimed in claim 4,said front surface of the chamberbeing defined by a stretch of flexible belts.
 6. A no starter roll, openthroat, vertical chamber round baler as claimed in claim 5,said rearsurface of the chamber being defined by a stretch of flexible belts. 7.A no starter roll, open throat, vertical chamber round baler as claimedin claim 6,the stretch of belts that define said front surface of thechamber being looped under the front roll of the pair of rolls.
 8. A nostarter roll, open throat, vertical chamber round baler as claimed inclaim 6,the stretch of belts that define said rear surface of thechamber being looped under the rear roll of the pair of rolls.
 9. A nostarter roll, open throat, vertical chamber round baler as claimed inclaim 8,the stretch of belts that define said front surface of thechamber being looped under the front roll of the pair of rolls.
 10. A nostarter roll, open throat, vertical chamber round baler as claimed inclaim 1,said rigid tooth feeder comprising a rotor that operates in acircular path of travel, said rotor having teeth that project outwardlyfrom the axis of rotation of the rotor and sweep into and through thethroat generally toward the inlet during each rotation of the feeder.11. A no starter roll, open throat, vertical chamber round baler asclaimed in claim 10,said front surface of the chamber being defined by astretch of flexible belts.
 12. A no starter roll, open throat, verticalchamber round baler as claimed in claim 10,said rear surface of thechamber being defined by a stretch of flexible belts.
 13. A no starterroll, open throat, vertical chamber round baler as claimed in claim12,the stretch of belts that define said front surface of the chamberbeing looped under the front roll of the pair of rolls.
 14. A no starterroll, open throat, vertical chamber round baler as claimed in claim12,the stretch of belts that define said rear surface of the chamberbeing looped under the rear roll of the pair of rolls.
 15. A no starterroll, open throat, vertical chamber round baler as claimed in claim14,the stretch of belts that define said front surface of the chamberbeing looped under the front roll of the pair of rolls.